I'm not sure what it's called - by overlay I mean the thing that shows details of an item being auctioned when you mouse over it. Since I installed the ecc minimap mod this overlay has been blank. It shows a box with no content (I can get a screenshot). Rebooting/relogging has no effect.
Confirmed this back in the days when the 1.8 version of the minimap was still new... the minimap loves to mess up things. (The fact that it stopped working completely was the main reason why I no longer use it.)
I posted a bug on this before, but I figured out the solution a day or two after. Press the N key until the minimap is hidden off the screen and you should be able to see the overlay
It should have? It fixes it for me when the minimap is hidden. I think it worked for @Imaginex too because I told her about it